After multiple severe heatwaves in a single summer, French residents are increasingly factoring high temperatures into their home hunts, realtors say, bumping up features such as shutters, air conditioning and indirect sunlight on their priority lists.

In Paris in particular this summer, the steep temperatures turned apartments directly under iconic Haussmann-era buildings with zinc-covered roofs into virtual ovens.

"On the top floor of a Haussmann-style building, the heat indoors can become truly unbearable," said Joseph Denke, an estate agent with FredeLion in Paris.

READ ALSO: VIDEO: Why Paris' zinc rooftops are hot enough to cook a crêpe

He has noted a shift in buyers' priorities in recent months, including being wary of south-facing windows.